More than 40 load-bearing columns of an underground garage in Nanchang cracked. Is it a natural disaster or a man-made disaster?

Due to the epidemic situation, the CCTV 3 15 party was postponed to July, which exposed the problems generally reflected by consumers. Among them, when the owner of Guangzhou Vanke inspected the house, he found that his building was doing a water storage test and the bathroom downstairs became Vanke. Elaborate? Water curtain cave, but the owners of Guangzhou Vanke will feel much luckier when they see Nanchang Hon Hai Vanke Sky City. After all, they just leak water, and Nanchang Vanke may be the one who leaks water. After the so-called expert field investigation, they thought it was a natural disaster, not a man-made disaster. Is it possible?

1. Natural disasters cause cylinders to burst? Recently, some related media broke the news that several columns of Nanchang Hon Hai Vanke Sky City Garage burst, some walls cracked and the foundation sank. After the incident, on July 12, the developer issued a statement saying that the situation was true and had reported it to the competent government department. According to the on-site investigation by relevant experts, due to the continuous heavy precipitation in Nanchang, this part of the basement is still under construction and the roof covering has not been completed. The preliminary judgment is that the increase of groundwater buoyancy leads to the cracking of the column, and the specific reasons need further analysis.

After the news came out, there were many comments on the Internet. Most netizens think that natural disasters can't lead to column explosion, which is rubbing people's IQ on the ground.

This is not a natural disaster, but a man-made disaster. According to the information released by the relevant departments of Nanchang, there are heavy rains in Nanchang, with local heavy rains and accumulated rainfall of 20? 100 mm, local 150 mm or more; The maximum hourly rainfall is 40 ~ 60mm. Among them: the night of the 23rd? Heavy rain on the 24 th, local heavy rain; On the 25th, heavy rain turned to moderate rain, with local heavy rain in the southeast. When a thunderstorm comes, it may be accompanied by strong lightning, short-term heavy precipitation, thunderstorms and strong winds and other strong convective weather. According to the comparison of heavy rainfall information released in previous years, there is little change. A few years ago, Nanchang also had properties that were not much different from Vanke. Why in the same environment, there is no problem with buildings of the same size, but Vanke has problems?

The pillar has been decorated with white paint. So the strength of this column should have reached 100%. Not a building under construction. According to the design specification, it is also consistent, so this light rain should not cause the safety problem of the column. Experts say that the buoyancy of groundwater increases because of the rain, but according to the current engineering pictures, there is no water in the basement. Where is the buoyancy of groundwater? Moreover, if there is groundwater buoyancy, the buoyancy is upward, which is equivalent to reducing the load of the bearing column, which is very puzzling.

The rain will really cause the safety and pressure of the basement structure, which should be the increase of lateral pressure caused by the saturation of backfill soil. But this lateral pressure is exerted on the shear wall, which has nothing to do with the internal load-bearing columns. Experts should be talking about outdoor ground, because it will increase the water saturation of backfill soil, but it should not cause the damage of heavy columns. Even if the rainstorm load is really too large, the first problem should be the reinforced concrete beam.